Portable speaker system



FIG. 1 is a top, front perspective view of a portable speaker system showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing on the drawing disclosure is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for portable speaker system, as shown and described. 